Culvert.



T. A. HILL.

'GULVERT.

APPLICATION FILED DEC. 28, 1911.

Patented May 7, 19 12v Lwm 1,025,186. CULVER'I.

Brooklyn, N. Y., assignor to The Bunch Plow Works 00., Crestline, Ohio, a Corporation. Filed Dec. 28, 1911. Serial No. (368,258.

I To all whom it may concern:

Be it'known that I, Tnozuas A. Hum, a citizen of the United States, residing at the lmrough of Brooklyn, in the county of Kings and State of New York, have invented ccr' tain new and useful Improvements in Culverts, of which the following is a specification, reference being bad therein to the accompanying drawing.

My invention relates to improvements in culvert, conduit pipe and ducts of similar character and has particular reference to means for reinforcing and strengthening the same.

Referring to the accompanying drawings, Fi ure 1 is a. perspective view of a length of culvert formed of two interlocking sections. Fig. 2 is a broken section in plan on an enlarged scale showing the arrangement of the reinforcing or strengthening ridges or ribs,

and Fig. 3 is an end view of one of the sections.

The culvert illustrated m the accompanying (.lrawings is preferably made in two longitudinal sections 12-13interlocked in position by the lugs 14-4.?) in the usual manner.

Each section is provided with longitmliual ridges preferably tive in number of graduated cross sectional areas,the heaviest ridge extendin longitudinally along the crown indicated by the. reference character (3, the

THOMAS A. Hum,

next longitudinal ridges 5- 4 being some- 1 what smaller and the other two longitudinal ridges 4-8 being of still smaller cross section. 'lrunsverscly of these ridges are formed ridges such as l), 10 and 11, and these ridges are preferably heavier at the crown j than at their extremities both as to depth and width. They are also preferably alternated short and ong as shown to advantage 1 in Figs. 1 and 2. The greatest strain being along the longitudinal center of each section, the same is taken care of by the. increased material of the intersecting ridges in that portion. It will also be observed that the longitudinal ridges are preferably arranged closer together at the longitudinal center of each SQCllOfl than at the sides. lly this arrangement the greatest pos ible strength is secured with the least expenditure of material and weight.

Of course it will be understood that various modifications may be made without departing from the spirit of the invention as set forth in the claims.

I claim:

1. In a tubular conveyor of two longitudinal sections. transverse and longitudinal ridges upon theouter surface of each section, said transverse longitudinal ridges deeper and wider at the center than at the sides of each section, and said transverse ridges alternating short and long throughout the length of each section.

9..- In a tubular conveycr of two longitudinal sections, transverse and longitudinal ridges upon the outer surface of each sec-. l

tion, said transverse longitudinal ridges deeper and wider at the center than at the i dinal sections, transverse and longitudinal ridges u on the outer surface of each section, sai transverse and longitudinal ridges deeper and wider at the center than at the sides of each section, and said transverse ridges alternating short and long throughout the length of each section, said short transverse ridges of smaller cross section than said long transverse ridges.

In testimony whereof I atilx my signature in presence 0 two witnesses.

THOMAS A. HILL. Witnesses Lomsn Enosann,

Ave. P. Joaeaussn.

long throughout the 

